enforce positive coverage (#1993)

* enforce 0% coverage diff

* test coverage reduction causes CI failure

* enforce patch target of 90%

* move untested code

* revert test code

.github/workflows/testing-and-deployment.yml

@@ -195,9 +195,9 @@ jobs:
         run: |
           xvfb-run pytest -v --cov pyvista --cov-report html
 
-      - name: Upload coverage to codecov.io
+      - uses: codecov/codecov-action@v2
         if: matrix.python-version == '3.8'
-        run: bash <(curl -s https://codecov.io/bash)
+        name: 'Upload coverage to CodeCov'
 
       - name: Check package
         run: |

codecov.yml

@@ -4,5 +4,19 @@ comment:
 
 coverage:
   status:
-    project: off
-    patch: off
+    project:
+      default:
+        # basic
+        target: 90%
+        threshold: 0%
+        # advanced
+        if_not_found: success
+        if_ci_failed: error
+        if_no_uploads: error
+    patch:
+      default:
+        # basic
+        target: 90%
+        if_not_found: success
+        if_ci_failed: error
+        if_no_uploads: error